Yes, that is exactly what happened to me. I rode the B17 for several thousand miles and really liked it....but I always felt my sitbones were maybe right on the edge of the metal under-frame.
'Tightening the saddle' and 'pulling the leather under' would do absolutely nothing to correct this issue. The metal frame of the sit area was simply too narrow for my pelvic bones.
As I rode it more and more that first year, I saw that my sitbone 'dents' in the leather were indeed positioned half way over the frame edge on both sides of the back. That's when I sold the B17 and ordered the B68, and as soon as I got it I knew it was perfect. Happy ever after. Now the new leather sitbone dents are plain to see and they are where they should be- on the leather, not halfway on the frame edges.